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Fotografia = 2/5*600 = 2*600/5 = 1200/5 = 240
Participan en fotografia 240 alumnos
Dibujo = 1/3 * 600 = 600/3 = 200.
Participan en dibujo 200 alumnos
No participan = 600 - 240 -200 = 160
No participan en ningun concurso 160 alumnos.